839820613 has 2 divisors, whose sum is σ = 839820614. Its totient is φ = 839820612.

The previous prime is 839820607. The next prime is 839820661. The reversal of 839820613 is 316028938.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 791128129 + 48692484 = 28127^2 + 6978^2 .

It is a cyclic number.

It is not a de Polignac number, because 839820613 - 2¹⁷ = 839689541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (839820673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 419910306 + 419910307.

It is an arithmetic number, because the mean of its divisors is an integer number (419910307).

Almost surely, 2^839820613 is an apocalyptic number.

It is an amenable number.

839820613 is a deficient number, since it is larger than the sum of its proper divisors (1).

839820613 is an equidigital number, since it uses as much as digits as its factorization.

839820613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 839820613 is about 28979.6586073749. The cubic root of 839820613 is about 943.4716251728.

The spelling of 839820613 in words is "eight hundred thirty-nine million, eight hundred twenty thousand, six hundred thirteen".